Does this handle (lots of) (sometimes large) page updates, particularly across a semi-slow, semi-reliable network? Think lazy loading, sPA-style diff-based page

Does this handle (lots of) (sometimes large) page updates, particularly across a semi-slow, semi-reliable network? Think lazy loading, sPA-style diff-based page transitions, or realtime progress bars. What about element positions (i.e. for switch control overlays that visually mark specific elements on the page)? Assuming this just sends keys directly to the remote browser, what about cursor-related events in editing fields? If latencies are over a few ms with those, some screen readers get confused.